Thresher-screen.



UNITED STATES PATENT OF ICE.

JENS I-I. JENSEN, OF MINDEN, NEBRASKA.

THRESHER-SCREEN.

SPECIFICATION forming part of Letters Patent No. 648,588, dated May 1,1900. Application filed anuary I7, 1900. gerial No. 1,804. (No model.)

To all whom it may concern/.-

Be it known that I, J ENS H. JENSEN, a citizen of the United States,residing at Minden, in the county of Kearney and State of Nebraska, haveinvented certain new and useful Improvements in Thresher-sieves; and Ido declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,which form a part of this specification.

The invention relates to thresher-sieves' screen is made adjustable bothlongitudinally and laterally.

Figure 1 of the drawings is a perspective view of my sieve, the upperscreen having been adjusted in the two directions at right angles toeach other, so as to give the maximum size to the holes; and Fig. 2, aplan view showing an adjustment which gives a minimum size to the holes.

In the drawings, A represents the frame of the sieve, to which is madefast the lower screen 13, while 0 is the upper screen, which is madeadjustable on screen B in two directions at right angles to each other.The holes or apertures in the two screens are preferably made square orrectangular and to correspond. To the upper screen 0, I rivet the flatbar D, which is provided with the threaded lug cl, which is at rightangles thereto and forming a part thereof. In this nut works the screwE, which is swiveled in the slot f of the vertical plate F, secured tothe edge of frame A. By applying a suitable wrench to the squared headof this screw the top screen 0 may be adjusted in one direction. Atright angles to the bar D are made fast the two racks G G, in which workthe elongated pin ions H H on the ends of a rotary hand crankshaft I. Byrotating this shaft the screen 0 may be adjusted in a direction at rightangles to the direction of the screw E, which is thus moved along in theslot f of the plate F.

K K are the bearings of shaft I, and L the guides under which the screen0 moves. Through one or more of these guides may pass a screw to operatein connection with the nut, so that the two screens may be clamped together at any adjustment.

What I claim as new is- 1. A thresher-sieve consisting of the frame A,the fixed lower screen B, the movable up per screen 0, the bar D havingthe threaded lug d, the fixed plate F secured to frame A and havinghorizontal slot f, the screw E swiveled adj ustably in said slot andworking in said lug, the racks G secured to the screen C and thecrank-shaft I rotating and sliding in bearings on said frame, the saidshaft being provided with the pinions H H as and for the purpose setforth.

2. In thresher-sieves, the frame A having Vertical, horizontally-slottedplate F secured thereto, the screen B made fast thereto, the movablescreen 0, the bar D secured to screen 0 and having threaded lug d at oneend, and the adj usting-screw E engaging said lug and the slot in plateF in combination with means substantially asdescribed for adjustingscreen 0 at right angles to bar D in the manner set forth.

In testimony whereof I affix my signature in presence of two witnesses.

. JENS JENSEN. Witnesses:

THOMAS JENSEN, VAL JENSEN.

